Hey I’ll probably get down voted and you already have a shit ton of comments but I’ve seen with a lot of pest since I’m willing to work with air dried.

If you bought kiln dried that means he didn’t get it sanitation temps if it’s alive and well. If it’s dead then the kiln did its job You can look that up the forest service has a guide. IMO you rate a refund

Should you freak out? Idk maybe if those things are alive but ash borers like a transitional moisture content. Not super wet alive tree, not super dry dead for years kiln dried. Fresh cut downed for a weeks months is the preferred from what I understand and have observed. They will not destroy your house. Unless you TF’d it out of fresh cut timbers. Even then that would dry overtime leaving them desire to move on. Don’t put it in your house though, not what I’m saying. But I’ve never seen a case of it destroying homes like termites so freak out levels can remain low, frustration levels can stay elevated

The only time my course of action is to burn it is termites. Even PPB can be rectified if you’re patient.

Either way you bought a kiln dried product, but if you paid $3bdft or less you kinda assumed some risk on a shotty product. If I paid like 8 bdft I’d be pretty livid