US Immigration from Canada

Hello,

Quick question and excuses for not finding the answer.

I am about to have my GC interview and will then need to travel to USA for a few days for an event and then back to Canada for a few weeks to tie loose ends before making my way down.

The assumption is that I will receive my passport with the stamp prior to traveling to the USA the first time.

1. Do I trigger anything by crossing into the USA? Am I obligated to give the packet to the CBP officer?
   1. Does it change anything if I cross with my Nexus instead?
2. Will I be able to go back to Canada before receiving the plastic green card and re-enter the USA with no issues or am I stuck waiting for it?

Thanks in advance!

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