Thanks for you reply @BMcCalpin
Yes, I have two W-2s from two different employers for the 2019 tax year. And when I add up box 4 on both the W-2s, it exceeds $8240 limit. The excess amount is specified in "line 11 of Schedule 3 (1040)" and the same has been copied to line 18d of Form 1040. Also, this return wasn't filed electronically instead I did paper filing, as I had to request ITIN for my spouse. Hence, I know they have got W-2 copies along with my 1040 filing.
Also, when they ask to send "Other forms reporting wage and withholdings" (along with W2s), should I also send them 1099-Bs? This by the way is not relevant to the question they have on line 18d of Form 1040.
