Originally Posted by Polaris OBark

Not yet.

We can take this further.

We know two things:

(1) The OP had an order mix-up
(2) Canyon told the OP that there were other instances of this.

If there were one or two mix-ups, then I agree that the most parsimonious explanation is that it was just a random, innocent mistake.

However, if there were a whole bunch of mis-fulfilled orders, we can start to suspect other explanations.

If the latter is the case, then with a bit more information, we could test the hypotheses, i.e.,

If it was a random, no-fault innocent series of mistakes, then one might expect a random distribution of mislabeled boxes (eg, for every M labeled S, there should be an S labeled M).

If something else was going on (involving intent on the part of even a single individual -- no conspiracy necessary), one might expect a systematic skewing, such that all of the mix-ups were of the form M substituted for S. If that is the case, Occam's Razor comes down rather unambiguously on the side of something else going on.