ariaspi: Are you sure you don't have them as
Classic?
Aemenyn: Seems unlikely, since their account was created after the removal and re-adding of the Fallout games.
Yeah, seems likely that multiple accounts created inadvertently is the likely cause. I've got some friends whom have created a GOG account to get a free game I've told them about in the past, whom never went on to purchase any games from GOG or interact with the service in any meaningful way over time who later went on to create another account the next game freebie that came along, forgetting they already had an account and wondering where their previous game freebies were. A lot of people seem to forget to use the "I forget my account name and/or password" feature when doing this and end up making new accounts, possibly forgetting their past account even existed. It's a common thing for many to do it seems.
Solution is to do an account recovery based on any email addresses one owns or has used in the past to try to determine what accounts they may have had in the past. Mind you, I know some people who have thrown away email accounts that got hijacked or for other reasons over time too and ended up locking themselves out of various online accounts that were bound to those email accounts as well. The solution to that of course is to use a password/account manager software like KeepassX or PasswordSafe and exercise more responsibility in managing accounts and passwords in the future to avoid losing access to accounts previously created, and potentially to video games acquired in those accounts with regards to gaming accounts anyway.
A buddy of mine has lost hundreds of dollars of games on Steam and other platforms due to being negligent with regards to how he handles his accounts and passwords, and seemingly never learns, continuing this bad practice. I've offered to help him set up a proper password manager many times as it's a shame to see, but you can lead a horse to water but not force it to drink as they say. :)
Anyhow, hopefully the OP finds the correct account used for previous freebies and can recover it. GOG support may be able to assist in that process as well.