Most pharmacies don't have specific written policies regarding receipt of materials. It's usually who's not fast enough to duck out who gets picked. Your best bet is to assign a chain of responsibility whom to contact for deliveries in your absence (eg., you, the lead tech, the senior tech, etc.)
There's a bunch of policies I found. You can review them and pick out the best parts:
http://www.nashville.gov/general_hospital/opportunities_vendors.htm
www.auditnet.org/docs/Store%20Audit%20Program%20-%20Drugstore.doc
http://www.tamesideandglossop.nhs.uk/pdfs/MEDICINES%20POLICY%20AUGUST%202004.pdf
