Hi,
I have seen people who got the wes assessment 20 days before the mentioned date in mail.
just call them, mail them and request urs a urgent scenario by mention some special scenarios.
If u do not receive until 26, u can send without that and send the wes assessment later.
Consult with more people what will be best option:
Missing document addendum or mentioning the truth: Both cases, if they do verification check on which date u received the wes, i guess its a problem for u.
before all that, wts ur NOC?