Proceeds for escheatment/unclaimed property reported on 1099B

[m25]

I received a notice of escheatment/unclaimed property from a former employer, and subsequently received a check (early in 2019).  When I was employed there, the company was public; after I left, it was acquired by another company and taken private.  I left in 2012 and have no idea what the check was for.  I have received a 1099B with Box 5 indicating Non-covered Securities - Code X (unknown holding period).  The 1099B provides number of shares and date of sale, but does not provide date of acquisition or cost basis.  In TurboTax, it asks me to choose the "type of investment you sold" - I'm not sure what to pick here...it could be stock, options, or "everything else" (the Learn More link says this could include liquidating distribution)?  Any advice?

[Anonymous]

there mo description of the item on the 1099-B?.     stock is as good as anything date acquired use "various"

the the check is probably for the redemption of the stock you got sometime around 2012.  what you don't know without a cost basis is whether you have a gain or loss.     you could contact your former company to see if they can provide any cost info. if not, it's in your hands to make an estimate.