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.