Nor do I, off-hand- I've never dealt with them that I can recall. (I'm thinking nematodes are way more likely in W/C snakes though?)
This article has a chart that offers treatment suggestions, including good 'ol Panacur.(see the far right column): https://www.vetfolio.com/learn/artic...es-of-reptiles
(I would avoid using Ivermectin on a snake- it's far more risky.)
Here's a few articles that might help? https://www.reptilesmagazine.com/rep...nt-levamisole/
https://www.merckvetmanual.com/exoti...es-of-reptiles
BTW, somewhere I read that nematodes are very common in lizards- hmm? That rings a bell, your source breeds geckos, right?
https://wagwalking.com/reptile/condi...des-in-lizards
Since Panacur is quite often used for snakes (& is used safely) I wouldn't worry about testing for nematodes if you can't find them in the RAL list- I'd just treat for them, personally.
(BTW, did you happen to ask the seller if he's ever treated this suboc with meds for anything? Especially anything recent?)
And I'd consider using Flagyl as well: https://www.reptilesmagazine.com/pro...dazole-flagyl/