this type of things are 100% to be careful with. i there in website business for at last 13 year but my regular habit to handle is
step 1) order online products only cash on delivery and not with credit/debit card or net banking.
step 2) when at taking parcel, i always do sign the parcel first for his record then gives parcel to mom for uncover all tapes with knifes.
step 3) i go upstair in my room to take money for parcel.
step 4) in my last case it was for motorola moto m so when my mom pressed power button and i show boot logo then only i was paid money for parcel.
