If you mean you put it in an AP red mailing box, there are several possible outcomes.
I've read about one Sendle parcel being delivered as addressed by AP with no additional charges.
It could be returned to you due to insufficient postage.
It may be delivered as addressed with a bill sent to you for the underpaid postage and any applicable fee.
It may be delivered as addressed with the recipient having to pay the underpaid postage and any applicable fee. This scenario is the least likely given that the sender's details are on the Sendle label.
Considering it doesn't have a valid AP tracking number, it may even disappear completely.
During the peak season, anything could happen with items in the AP parcel delivery system.
