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Our former PR representative was a casino collectibles enthusiast, who amassed chips and room keys and could have shed more light on your inventory, but in theory yes, chips, room keys, players club cards, ashtrays, match books, and the like are indeed sought after by collectors. Prices depend on condition, rarity, current trends, and so on, with some items reaching astonishing prices.
As a rule of thumb, the older the item, the more valuable it becomes. For example, if you happen to be in possession of a players club card from the now defunct Dunes (the former site of the current Bellagio resort), not many of them were issued, so the face value is now upward of $500 for something that was free to obtain at the time. As far as we know, the current record for the most money fetched for an old chip was in 2007, when a rare $100 denomination check depicting a Sphinx sold for $100,000 cash.
As far as matches are concerned, again rarity, popularity, and condition are the key factors in determining what a book might be worth. Matches from closed casinos are obviously worth more, usually selling for a few dollars: For example, we read an undated article on this subject that stated a nice unstuck (no matches have been scratched on the strike plate) booklet from the Sahara from the late 1950s might fetch $5-$8 (if the article pre-dated the casino's closure, then that figure is probably higher today), while an example in equally good condition from the Lucky Strike Club downtwon might actually command a few dollars more, because there were never as many of these made. A good place to check on current values is the Casino Chip & Gaming Collector's Club, plus many collectors buy and sell on Ebay, where you'll find some books going for just a few cents each, while the most desirable matchbooks might reach $15 or more.
