On: Online databases dropping like flies, with 10,000 ...

[nightski]

Actually don't rely on my advice but I am pretty sure if you can't prove when you originally bought it and for what price you have to pay capital gains on the FULL amount. The burden is on you not the IRS.

[_skel → nightski]

Yep. See the second page of the tax form instructions here: https://apps.irs.gov/app/vita/content/globalmedia/4491_capit...

"If taxpayers cannot provide their basis in the property, the IRS will deem it to be zero."

That means 100% of the sale price of an asset is treated as gains.