Here's my experience: Forget bringing in anything with an electrical cord attached. The people working in Customs have an anal fixation on anything with a cord attached to it (and probably some DR1ers can personally testify to that, jajaja)
I brought in a 40' container of drums, bags, etc of chemicals, and one small box with a replacement 1/4 hp motor inside. Three Customs officials spent 3 hours on that motor, and ignored the rest of the shipment, even when I asked my pal if they were going to check the nuclear waste in the drums. They didn't bother. After 3 hours, they decided that the paperwork was correct, they had all of the numbers recorded for whatever office would want them, and that it would be OK to release the shipment.