I've finished the P's. OK, and the Q's. The Q's might have been the EASIEST letter to go through! I didn't find anything I needed from the Q's, mostly because are a grand total of 2 casinos, and only 1 has $1 chips (Quad, The). However, the P's are a different story. Here's what we need:

Paris (Las Vegas) V5200
Pastime Club (Tonopah) E2210
Pioneer (Reno) V3220
Pioneer Club (Las Vegas) N2903; E2139; E2140; CG41274
Plantation (Sparks) N5762; N5457
Plantation Station (Sparks) V1313
Poker Palace (Las Vegas) N2852; V3229
Primadonna (Reno) E7302; N6658; N6659; N5466
Pu$$ycat a’Go Go (Las Vegas) N2855

If you happen to have ANY of these chips, we sure could use a scan or high-quality photo of them. Thank you VERY much for your help!