Maybe Im not understanding this, but do you know who it is? Or do you just have a suspicion its this guy whose ads youve found? If you know its him why dont you contact him about purchasing a set, stating your local so you will pick them up personally, then show up with a cop who cares. I doubt it works this way but maybe you can force him to procure receipts or something for all these wheels hes selling, and when he has none, bam thats your guy.
Or do the same without a cop, but bring a bat instead (j/k)
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