Accepting a risk of loss is not granting a license to steal.
Your awareness of their mistake doesn't obligate you to correct it, especially when the mistake is easily avoided and fixing is a non-trivial effort.
In the case of a business, I wouldn't be surprised if they count on exploiting that free labor in their cost projections.
by law no, but if this were a mom and pop operation, would you then return the TV? if so, then you know it’s wrong.
You might be surprised how much people appreciate others doing more for them than is required.