The Probably Stolen lottery ticket guide is short: open the ticket's Read view, hold the mouse button over the scratch area, and inspect the result. Take a winning ticket to the commissary; Demo 049 also allows winners to be redeemed immediately.
Probably Stolen lottery ticket guide: controls
Right-click the ticket and choose Read.
Click and hold while moving over the covered area as if using a coin.
Check the prize after the area is revealed.
Redeem a winner through the available commissary or updated immediate-redemption action.
The scratch action uses a hold-and-drag motion. If nothing changes, keep the button held through the scratch motion and check the active game's interaction prompt.