And remember to bleach your tracks. If they figure out what’s going on, I guarantee they’ll try everything from fingerprints to DNA on the caps, and even if the majority of the time the heat/vibration/dirt of the cap’s environs is enough to remove your traces, you don’t want to be on the long tail of that curve.
You want the generic black ones that you can find anywhere. That way they can’t trace the purchase down to you.
And remember to bleach your tracks. If they figure out what’s going on, I guarantee they’ll try everything from fingerprints to DNA on the caps, and even if the majority of the time the heat/vibration/dirt of the cap’s environs is enough to remove your traces, you don’t want to be on the long tail of that curve.