A homeowner requested to see all documents pertaining to the purchase and installation of our new locking mailboxes.  All processes and documents have been vetted by the HOA attorney, who found no problems.

This is a spreadsheet put together by the mailbox committee with Q&A.
Avondale Glen Mailbox Q & A

These are the estimates.
AG Mailbox quotes

This is the email and reply about beginning work.
Email re beginning mailbox work

Additionally, there were numerous conversations with the contractor and the postmaster to make sure everything was done correctly and on schedule.

The new mailboxes are covered under our HOA insurance policy and there is a line item in the budget for maintenance as needed.