[mothered]

If that is the case, would it be safe to eb 2 pairs of shoes, rather than 1 since they wouldnt be checking the weight regardless?

It's touch and go.

Firstly, It's not very likely two errors were made on the same order. Secondly, claiming 2 pairs were missing, may trigger an Investigation. I'm not suggesting It won't work, but rather outlining the circumstances of the claim.