No. Don't need to. Thieving and things getting broken accidentally on purpose in sorting houses is extremely common.
Doesn't surprise you in the slightest. My Sister sent me about £300 in Asda vouchers a few years ago, they turned up "damaged" and £10 missing. No shame.
Not wanting to stick up for the Royal Mail, but the documentary is about private mail/parcel companies.
The Tories are about to sell off the Royal Mail. This is what happens when a public service is ran for profit and share holders.
Untrained low paid staff with an uncaring management/supervisory dept with little or no motivational process and greedy executive and top management staff getting bonuses and such choose what they do.