I called Canada Post this morning and apparently US Custom is rejecting all boxes with other (older) labels on it.
I don't doubt they told you this but it's a load of crap. Personally I am not experiencing any delays out of the ordinary (means most arrive under a week with some taking up to 2 weeks) for small packets and first class mail.
Ben

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.