It took about 3 seconds to check. Pop open the case the tapes came in and look at the plastic window and you can easily see both reels. If the tape was all on the left reel, it was rewound. Just about all rental places did this when you returned the tape. Audio cassette tapes were the same way. The VHS cassette was basically just a larger version of an audio cassette with wider and longer tape.

Pic of rewound VHS: https://www.becomingminimalist.com/wp-content/uploads/2008/0...