I'll check with the lawyer on Monday. I see both addresses on that site. Check out this link.
http://www.canadainternational.gc.ca/mexico-mexique/contact-contactez.aspx?lang=eng
One other potential problem has arisen. We've decided to send my wife and stepson's passports and other documents to the embassy via UPS. Again, there is no UPS facility in my wife's town, so, as indicated earlier, we will have to send a messenger to UPS in the capital of my wife's state with the package and to pick up the pre-paid envelope. Now, according to the guy at UPS, UPS doesn't ship to my wife's town, so on the pre-paid envelope, we'll have to put the address of the UPS facility as the "to" address and then the guy from UPS will arrange shipment to her hometown once the package arrives at UPS. Now, how that means that UPS doesn't ship to my wife's hometown, I have no clue. To me, that is UPS shipping to her town. I'm just repeating what the guy said to my wife.
My question is this. If the representative from UPS does in fact write the UPS facility in the capital city of my wife's home state as the "to" address on the pre-paid return envelope, will my wife then have to change her mailing address in the cover letter to match the UPS facility address? This is only a one-time thing for the purposes of receiving her and my stepson's passports and visas back. Or, would my wife keep her mailing address in the cover letter as her current mailing address in her hometown and instead enclose a note with the documents explaining to the embassy why the return envelope shows the "to" address as the UPS facility in the capital of my wife's state and make it clear that this is only being done one time only for the purposes of getting her passports and visas back? Would this be considered a change of mailing address to the embassy, and could it cause delays? Please get back to me as soon as possible. Thank you, and have a good weekend.