Shipping through the USPS

I bought a pair of Edelbrock heads from a FABO member a while back. I followed them via the tracking number until the day they were to arrive. I got home that day & there was a USPS notice on my door telling me I had two packages at the Post Office. I took the notice to pick them up & asked why they weren't delivered to my house. The answer was, " The carrier said they were too heavy for them to take from the truck & put on my porch". The attendant brought them out, I put one on each shoulder & walked out. Edelbrock aluminum heads are NOT that heavy, I think the carrier was lazy in this case.