Need to re-file 83(b) forms in these 2 cases?

I filed 2 83(b) forms and am thinking that I may need to mail an additional copy of each one to the IRS to ensure that they're received and processed correctly:

(1) I mailed one that was to go certified mail, and the envelope had a return receipt attached to it. However, the postage that was paid for was only for certified mail, no return receipt, and the certified mail tracking number can't be tracked; the USPS website states that no information is available.

Should I mail another copy of this one with a return receipt as well?

(2) I mailed another one for a foreign person who is in the process of getting a visa. He isn't yet working in the US, but he will be, and so I mailed it to the IRS address for the state where he will be paying US income taxes--not the IRS address for foreign tax returns.

Should I mail another copy of this one to the IRS address for foreign tax returns?

Thanks!

You have to attach the form to the tax return as well, for the year in which you filed it.

(1) I mailed one that was to go certified mail, and the envelope had a
return receipt attached to it. However, the postage that was paid for
was only for certified mail, no return receipt, and the certified mail
tracking number can't be tracked; the USPS website states that no
information is available.

Should I mail another copy of this one with a return receipt as well?

The USPS can track the certified mail and tell you if and when it was delivered. If you can't track on-line - call them. That's the whole point of the certified mail.

(2) I mailed another one for a foreign person who is in the process of
getting a visa. He isn't yet working in the US, but he will be, and so
I mailed it to the IRS address for the state where he will be paying
US income taxes--not the IRS address for foreign tax returns.

This should be done properly and with an assistance of a EA/CPA verse in the taxation of non-residents. I'm not sure the way you did it is a correct way.