If the screenshots are accurate, he essentially admits that he had stolen the balances of your gift card.
However in this
post, the alleged scammer is still trying to sell your gift card for bitcoin. Is there any chance that you can still use the Vanilla gift card before he does (since he is selling the gift card, which means that he may not have drained it yet), or is he attempting to scam with that currency exchange thread as well?
Also, in this thread:
https://bitcointalk.org/index.php?topic=5079544.msg48424748#msg48424748, he puts down his email of
panchito123497@gmail.com, which is linked to an army of accounts used to scam in the past
here.
There is pretty much no chance of getting your money back if you can confirmed he'd already used all of the balance in your card. At least it is a small loss, but please, don't deal with newbies without escrow in the future.