The answer to your question: "How much are these chips worth" is ... we will know in a few hours (2:10 pm PDT) what this particular grouping of 21 chips is worth at auction. As for a prediction, I'll take a shot at it, just for fun --

Starting with TCR low values, the chips pencil out at $950, as follows:
MGM Grand (L value = $75) x 6 chips = $450
Maxim (D value = $10) x 4 chips = $40
Caesars (F value = $20) x 5 chips = $100
Frontier (K value = $60) x 2 chips = $120
Flamingo Hilton (K value = $60) x 4 chips = $240

Face value of the chips is $105, and current bid level is $305, so we can assume the lot of 21 chips will go for somewhere between $305 and $950 (unless they exceed TCR individual values, which I doubt ... but anything's possible.

The chips are nice older chips, all from LV Strip casinos, but nothing ultra rare. Condition is probably typical, nothing pristine condition, since they weren't "professional" collectors. AND the total value will be suppressed, IMO for 2 important reasons: the multiple #'s of each chip means that a collector will likely be keeping (at most) 1 chip and re-selling the duplicates, plus the higher group value ($950, based on TCR) means that the group of bidders is constrained to those with some $$$ in their pocket. Mostly dealers, but some collectors too. These factors will impair the final value of the group (vs. the amounts that could have been achieved through separate, individual listings).

So... If you figure that a buyer might keep 1 of each chip, the TCR values for 1 of each is $225. Call it $200, with a little discounting.
Then the extras, with TCR group values of $750, set a price target of 1/2 TCR, or $375 for the duplicates. That makes a lot total of $575 ($200 + $375), as a bid target. I'll pick a $50 spread value surrounding this $575 figure, and predict that they sell in the range of $550 - $600.