I've never tried this before and I'm a little confused.

I've read the instructions
here &
here, but it appears that things have changed a bit since the instructions were last updated.
Quote:
"To participate please reply to this thread and then PM the person above you with your e-mail address (that e-mail address can not have been previously used to create a webscription / Baen account)."
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All requests go to piperclassique now, correct? Do I still need to provide an email address for the code or will piperclassique just PM the code to me?
Are there any problems using Gmail "plus" addresses
Code:
for someone@gmail.com:
someone+baen1@gmail.com
someone+baen2@gmail.com
someone+baen3@gmail.com
etc.
to get codes from Baen?
Are the codes tied to a specific monthly bundle or can they be used with any bundle? There are currently 3 available bundles (March, April, and may 2016). If I want 2 or 3 of them, what do I need to do?
Is there a limit to how many different codes I can use in a single month? Do the codes expire?
Thanks.