I have trouble believing that the liquor store is selling Girl Scout cookies. The GSUSA authorities would never allow a booth sale to be held at a liquor store, even if the local statutes allowed minors to be in the area.
However, it's possible that the owner of the store is a GS parent with a garage full of cookies ...
And you would probably be correct!!! When we still lived in Dover, before our daughter got involved in GS, the local liquor store was exactly where I bought the cookies...the owners had 2 daughters in GS.