Given that it's been well over a year and your snake has good body condition with no regurgitations I think you can safely rule out crypto.
What most folks don't realize is that over time parasites develop their own resistance to wormers just like bacteria develop them for antibiotics. This is why your snake is being given two different wormers now, both of which are effective against the parasites he's carrying, and neither of which are Panacur.
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