I have a few suggestions:
Firstly try contacting Donald Trump, he recieved a Purple Heart as a gift and mentioned he always wanted to own one.
Two, Admiral McCains medals were sold by his family so try contacting John McCain as someone in his family sold those. Maybe they could share more light on why they did this and how this law means families will no longer be able to sell these medals.
Three, a high profile collector of medals is Lord Ashcroft in the UK, he is a famous businessman and collector of Victoria Crosses however I do know he has US medals in his collection. Maybe mem