-snip-
Try to google.
The rate of airdrop 1 BTC = 10.000 HEX, the airdrop sended to Ethereum Address but you need to make a sign message of your bitcoin address to prove it the address belongs to you.
I also did and I think that you've missed the 2% weekly decay.
If you wait and don't claim until the second week, then the 10,000 BHX per bitcoin reward will be reduced by 2% and you'll only get 9,800 BHX per bitcoin. The bonus that was 20% in the first week will also get reduced by 0.4% and you'll only get a 19.6% bonus.
Each week you wait, the reward will be reduced by 2% and the bonus reduced 0.4% until week 50 where nothing will be left to claim.
So I'd wait to find out how much is now. I expect to be something insignificant (unless I've misunderstood something). Is OP still alive? Can he provide info?