Not true. Delivery driver stole an iPhone from me, no proof other than a really shit photo and i got a full refund. Turned out a week later the guard actually threatened the driver after he tried to re pickup the parcel and took it home for me. Free iPhone and a fired driver. Another time PC components. Driver had driven passed my house slowly 3 days in a row. 4th day i catch him opening the boxes down my street as im on way up to the house. Recorded the fella, told him to empty all boxes with my name onto the road or id break his neck. Man had box cutting knife on my gpu box ready to open it.

At the end of the day delivery drivers get paid slave labour, must be really tempting to steal something of high value in a van.

Best chance is to get friendly with the usual posty