A large chunk of my collection got nabbed back in 2009 when I was just starting to get heavy in to it. Luckily, I knew the thief and figured out who did it and was able to confront him with the police (who are sold old USMC buddies of mine) before he got rid of any of it. Got all of it back within 72 hours.
That said, at his place there were piles of stuff for different markets. Gamestop, craigslist, ebay, and pawn/retro game stores. He also had my more rare items in their own section since those would likely the titles stores would be on the lookout for.
What I was able to figure out is that the common stuff he was going to sell in chunks because who WASN'T trading in Gears of War 2, Ha;lo 3 and Mass Effect in 2009? Nothing suspicious there. Same with ebay and craigslist. He was selling the games in sets, with some of his own (stolen or not, I don't know) thrown in. Again, mostly popular titles.
The one thing that made a lot of sense, anything with distinctive marks - tape, marker, broken pieces, etc can be identified. These were separated out from the rest, possibly to get rid of out of town, or fix in order to avoid being recognized. That's actually how I was able to convince my law enforcement friends he had my property - I convinced him to send me a picture of something, and in the background is a PS3, with a chip on the corner. The same chip one of the officers was able to recall my model having
TLDR - if your games had distinctive flaws or markings, call around to local shops and let them know this was stolen and if (for exammple) an Earthbound with sharpie "Justin Family" on the back comes in, they'll know it's stolen. It's a long shot, but if the thief(s) are smart, they aren't just going to try and dump it all at once. What they didn't just throw away, that is.