Work Permit having two ETAs, one is invalid, but only invalid one has a letter of introduction...

[yandwanda]

Hello!
I have a Temporary Work Permit, got it approved and ETA was issued. I got a Letter of Introduction to show to the border official, with that ETA number and Work Permit number, along with a barcode to scan. Then, for some reason, a new ETA was issued, which invalidated the first one.
The problem I have now is that I didn't receive a new Letter of Introduction, that would list the updated ETA number. Everything else is correct.
Should I worry?

 

[yandwanda]

Bump.