DISCLAIMER: This is a just a tip and not meant to be the rule.
Here’s a tip for shopping on the used market. It’d be good to avoid used guitars that come without strings.
Sometimes we see in the advertisement that seller is throwing in a pack of free strings or what not, so simply request that the seller restring for you before you view/collect the guitar.
Sometimes we read that seller has removed the strings for storage purpose… protect the neck from warping and all. In this instance, one could simply loosen the strings to ease the tension.
Having no strings at the guitar could mean covering up for issues such as bellying, bridge lifts, dead machine heads, intonation problems and host of other issues.
So, it’s always wise to request that the seller put on some strings before you head down to see the guitar.