how does the post office know i have paid postage on my PPI items that i take to...

Jonathan

New member
...them. whats to say i cant lie? i use royal mail PPI but i am still a bit confused.
say i have 20 items per day, small jiffy envelopes. i pay for them online on my business account. then i take them to my post office but they just seem to throw them in with the rest of the stuff
i am not a criminal but whats to say i cant throw in 20 items and only pay for 10 online.
just confused as to how safe my mail actually is
 
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