As a buyer, make it as hard as possible for sellers to lie. Choggard aside, there are a TON of sellers who aren't "liars" on Pinside, but they see it as good salesmanship to "sell" their game as well as possible. If there is ever is a next time, there are some standard questions I like to ask. These are specific questions that leave no (or very little) room for interpretation, asking how nice something is is a bad question:
-Does the game have any moister damage such as rust, cab swelling, or anything else?
-Does the game have any play field planking?
-Is there any cab checking?
-Is the game a re-import?
-Are there any broken or incorrect plastics?
-Do all the features work?
-Are there any hacks on the boards? Are there any burnt connectors on the boards?
-Are the boards all original?
-Is there any insert lifting or sinking on any insert? (are the inserts level?)
-Is there any cracking or chipping around any of the inserts?
Also, some game/era specific questions:
-For WH20 for example - Is there any lost mine wear? Are the boulders cracked?
-For System 11's - is there myalr? Is the mylar lifting? Is it bubbling on any inserts?
These are just a few that come to mind, there are and should be more depding on the game, era, seller, situation etc. Again, this won't help a seller lying to you, but it will help you from being "sold" a piece of shit for top dollar. Basically, ask questions that leave no room for interpretation.
Ask a ton of questions, and if the seller seems hesitant or like your being a pain in the ass, HUGE red flag.