Dr Prager burgers with bun

The bun is PY

Aldi pretzel buns

These are PY

Rockland bakery

Must have either one of these codes 

1336

1340

And of course it must bear a Kof-k

Trader joes ice cream sandwich

These are NOT PY

Italian bread

This is pas yisroel 

Burry Bagels

These are py

Pressels pretzels

These are pas yisroel if they have the words מאיר בייגל printed on the tip of the bag