There’s a new trick to recover lost Amex offers if you forgot to do the multi-tab / multi-browser method. I was adding the Staples $25 of $100 Amex Offer to one of my American Express cards, when I realized I forgot to open up new tabs for the rest of my cards. I went to check the other cards, and indeed, the offer wasn’t there.
I was going to resign myself to missing out on the offer on my other cards, but then I noticed a comment from reader wwllmm on Doctor of Credit’s post, saying that you could get back offers you had lost with these steps: