Short Answer
Yes, it is allowed to work there or deliver these products because the service you are providing of scanning or delivering items is in itself allowed. Also, you do not own those products and are not the one selling them.
Advice
If you are in a difficult financial situation, put in extra time and effort to find better employment and continue to ask Allah for help regularly. One of the prayers taught by the Prophet Muhammad was:
“اللَّهُمَّ اكْفِنِي بِحَلاَلِكَ عَنْ حَرَامِكَ وَأَغْنِنِي بِفَضْلِكَ عَمَّنْ سِوَاكَ”
“O Allah, suffice me with Your lawful against Your prohibited, and make me independent of all those besides You” (Tirmidhi hasan #3563)
Shaykh Mustafa Umar
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