How many shoe boxes on a pallet?

Depends on what type of pallet and how high
The 3 most popular sizes are:
  • Standard 1.2 x 1M (48"x40" in USA)
  • Euro 1.2 x 0.8M
  • Asian 1.1 x 1.1M

You would need to wrap boxes together with clingfilm or similar to stop them moving & falling off
Assuming you use a standard pallet & go 1.4M high, you should load approx 260 pairs of men's shoes per pallet