Who called from 4157383950

That's apparently the number to a call center for DHL and / or Globex global delivery, tracking and checking a wrong delivery address.

You are correct. Received a call and package was delivered as advertised.

You were so happy with their delivery service that you decided to search for the phone number on a phone complaints site?

Hmmm.

Lurkers:
Beware of variations of scam # 19, as described here:
http://phonehelp.2truth.com/facts.html

http://www.whitepages.com/phone/1-415-738-3950

(415) 738-3950

Owner's name hidden by Whitepages for privacy reasons
Owner is based in San Francisco, CA
Landline - Teleport Communications America

DHL call to check if you get the package or not. Good caller.