Question about shipping label for a return item

[cyberenddragon92]

Hello,

I opened a return request for an item because it did not match the description. The seller accepted the return, and I printed out the label and dropped the item off at the USPS dropbox. I entered the tracking beforehand, but it does not seem to be recognized at all on USPS. Now I cannot seem to find a way to look at that label again. When I click on the email about printing the shipping label, it just takes me to the next step of the process which is waiting for it to arrive. Is there any way to view the shipping label again to make sure I entered it correctly? As it stands right now, this process has no updates, because the tracking number doesnt exist supposedly. Will this ruin the whole return process? This is my first return ever, and I really do not want to get screwed over. 

Thanks