I am confused whether I should use "a" or "the" when I refer to an object given/identified by some other object.
For example:
The package is now in [a / the] deposit box with the number you received by SMS.
For me this is the deposit box I previously stored the package in, but it seems to me, that for others (including the listener), it is still just some deposit box in the given vault: if I make a typo in the SMS message, my listener may hear from the front desk of the vault:
A box with this number does not exist in our vault.
Regardless of any such mistake, my assumption at the moment of speaking is that the listener will be able to find or identify the box unambiguously based on the number.
Which is the correct article in such situations?