White cloudy look around SGC holders....anyone familiar?

I am in the market for a 1951 Bowman Mantle and see two on EBAY graded by SGC. both holders show areas of white, cloudy appearance in a handful of spots around the border of the SGC slab. Is this more mommon w/ SGC?
Currently collecting all sports HOF Rookie Cards graded by PSA...for my sons Jayce & Luke.
Successful dealings with: ChiSoxCardboard,
lbcoach20, ShootyBabitt, cincyredlegs, pclpads, jwgators, hoopguru33, mphilking, daverat, Hallco, corvette1340, 8irvin8, Pre72, Estil, BigDaddyBowman, al032184. 1966CUDA, gwinny, samspop
Successful dealings with: ChiSoxCardboard,
lbcoach20, ShootyBabitt, cincyredlegs, pclpads, jwgators, hoopguru33, mphilking, daverat, Hallco, corvette1340, 8irvin8, Pre72, Estil, BigDaddyBowman, al032184. 1966CUDA, gwinny, samspop
0
Comments
any help is appreciated
Successful dealings with: ChiSoxCardboard,
lbcoach20, ShootyBabitt, cincyredlegs, pclpads, jwgators, hoopguru33, mphilking, daverat, Hallco, corvette1340, 8irvin8, Pre72, Estil, BigDaddyBowman, al032184. 1966CUDA, gwinny, samspop
Although, I've never seen one with that degree of frost. I would stay away.
The money you may save buying from some jamoke isn't worth the stress.
Steve
I looked at the SGC site to track the cert# and found no link to look up certs...does anyone know if they have one on the SGC site?
Successful dealings with: ChiSoxCardboard,
lbcoach20, ShootyBabitt, cincyredlegs, pclpads, jwgators, hoopguru33, mphilking, daverat, Hallco, corvette1340, 8irvin8, Pre72, Estil, BigDaddyBowman, al032184. 1966CUDA, gwinny, samspop
1958 Ed Mathews
Successful dealings with: ChiSoxCardboard,
lbcoach20, ShootyBabitt, cincyredlegs, pclpads, jwgators, hoopguru33, mphilking, daverat, Hallco, corvette1340, 8irvin8, Pre72, Estil, BigDaddyBowman, al032184. 1966CUDA, gwinny, samspop