An item like this would surely have a POD (proof of delivery) from the sender, contact ACER and ask them who they use for their courier service and if indeed a POD is required.
I doubt you would get compensated for this but a polite notice to the courier firm to advise them that items are being left in such a manner might make you feel better.
There may be an issue of the driver forging your signature dumping the goods and just driving off to their next drop.
I used to work in parcel delivery as a driver for 5 years and know of two occasions when this has been done.
In both cases the driver was sacked....
(i was not one of them)