How do I find a list of PDB structures bound to a peptide inhibitor or peptide-like inhibitor?
The quickest way to screen the PDB database is Advanced Search from either RCSB or PDBe.

Since you need entries with 2+ proteins you can set the number of protein chains to at least 2 in the RCSB search.  Or you can select "protein/protein complex" in Assembly composition in the PDBe search.

It's less clear how to search for inhibitors. If you'd look for the "inhibitor" word in the molecule names you'd get (together with the previous criterium) 1200+ entries.