It's weird to me that the lawyers he's consulted couldn't help at all or even make suggestions about what else to try. How many did he talk to? If he can afford it, it might be worth getting a few more opinions.
Or he didn't really consult with any lawyers.
Family member went with him to a lawyer and said it was no help. She says no one is willing to help because no one believes the story.
Family member also claims he submitted a sample to 23andme already, but results have been significantly delayed due to covid. Looking at the 23andme website it seems like they are still claiming results are obtained in 2-3 weeks, and also appears they've done some studies into covid-19 and blood type. So this piece of the puzzle isn't really adding up to me.
ETA: also not sure how useful genetic testing will be if everyone in his family was adopted
Oh of course EVERYONE was adopted! That makes TOTAL sense! And adoptions are never verified or filed are they? Families built through adoptions are just impossible to track down...
/s
(not at you OP, but wow this guy has an answer for everything. Is your family member typically this trusting?)
Genetic testing is VERY useful EVEN if he was adopted. The person that gave him up for adoption would know at least the name of the family he went to if it was a total under the table adoption, or the region they were freaking born in at the very least. But most adoptions do keep careful records of birth/names/locations/adopted family. In many cases, adoptions are MORE detailed that birthfamily births because if run through an agency - they make you submit family history, interview friends/family and have to approve adoptive families through the state.DNA and fingerprinting were both been widely available before COVID19. So why is he saying he just now thought about doing this? He's got to be 36-38 ish years old. Did anyone witness the taking of the actual test and the actual putting it in the mail without any possibility of him sneaking it back out? Because if he really had no idea and just did this stuff NOW... that in itself is highly suspicious.
Nothing adds up. No one is this completely clueless and there are too many far-fetched reasons for why he has no past/identity.
And no lawyer is going to "help" someone if they aren't paid, so he would need to PAY a lawyer/investigator to find records. Skip tracer investigators are very good and would be able to work with stuff like this easily and would not "throw their hands up in the air" if they're being paid for a job. But again, there is no way a 17 year old forgets where he lives, had never looked at a single piece of mail that came to the house, doesn't know his family member's first and last names...
I personally know someone that did have traumatic memory loss/repressed memories due to abuse. Wiped it clean from their mind like the abuse never happened. Discovered it after being low grade depressed and hurting themselves and got into therapy and on antidepressants and the memories came back suddenly and (unfortunately) crystal clear. Granted my experience is anecdotal, but we all did extensive reading/working with this person in counseling for support - and you do not forget EVERYTHING - names, places lived, city or states of long residences even with repressed memory. He obviously remembered being home schooled and things learned? So why doesn't he have total blanks for that stuff as well as his identifying information?
The family member - the one that is seeing him? - is biased and willing to believe his story. She (assume but apologies if it is he) assumes this person has been honest with them. So telling this same story to a lawyer (she went to an actual law office with this guy, legit place of business, not a meetup in a Starbucks or anything?)? It sounds like lawyer did NOT believe it and was telling them to hopefully clue your family member in that it isn't possible and the boyfriend is hiding/lying about something (or everything).
So long story made longer: he (really, one of you concerned about family member that is hooking up with this guy) needs to HIRE a lawyer or detective that specializes in tracing missing persons and have this guy submit officially/witnessed for fingerprinting/DNA and turn over any and all information he can remember, as they can do records searches, things like publish inquiries in all the local newspapers in the general region he remembers living for anyone that has information on his family and remembers the events that occurred. He HAS to remember living in Florida as a teen? If he can't remember the house/apartment he lived in with his aunt at age 17... that's just BS. Even Realtors can see who filed/owned the property and get the aunt's correct legal name. If she rented, the landlord would have that on file somewhere. Census for goodness sake!
It will take money and time - and he should be scrutinized by someone OTHER than the family member to keep track of the information he's giving and making sure it matches what was already told.
But honestly, depending on how much you care about family member - if they're a grown adult, then they really should have the right to decide they trust this guy or not - but I would definitely talk to her/him about trusting is fine, but verify facts as much as you can and do not put themselves in any position to be hurt or taken advantage of.
But they're likely being lied to at best. At worst, make sure to check in on them regularly and maybe get a good photo of the guy and fingerprints yourself if you care that much, but at least you can find out about running them in the event she/he goes missing. :(