Not unless you get the BTC from them. I (typically) write a note from the transfer transaction what my cost basis was of those coins. But, please note: there is no way to really verify this to any tax authority if you bought Non-KYC coins so, it would just be your word.
Discussion
Sounds like a bit of pita. But thanks for taking your time to respond. Robosats -> strike wallet -> win? Do you just put a random cost basis?
Robosats aren't really for my inflows anymore but more for getting cash for things I can pay in cash with. As far as cost basis I would just say, in most scenarios that are not KYC, there is no evidence of your cost basis so, do what you will with that info. As far as KYC bitcoin, a few movements through a few adresses in different amounts, also make it difficult to confirm cost basis to an outside auditor so, there's that.