9
The affidavit and publicity release
The paperwork between winning and being paid.
Above a certain value, very often a few hundred dollars, winning does not end with a notification. It begins a small administrative process.
A typical clause requires a signed affidavit of eligibility confirming you qualified, a liability release, and frequently a publicity release allowing your name and state to be used. Fail to return it within the stated window and the prize can be forfeited and re-awarded.
The publicity release has a second life: many states require a winners list to be made available on request, so the promotion needs permission to publish something. This is why winner lists are conventionally first name, last initial and state, enough to prove the prize went somewhere real, little enough to not be a privacy problem.