Yeah, personal items implies it's not sealed. Sealed items are risky to bring, I've never done that, but if you can prove it was purchased significantly before your travel date then customs is waved, I forgot what it was, likely a year or six months.
Then there's something called Transfer of Residence. Some relatives send over their entire house furnishings every few years, from chandeliers to TVs to sofa sets, from the Middle East. No duty whatsoever, everything is sent by cargo and takes a few days to reach your doorstep.
I have other relatives that visit only once every three years so they can bring a bunch of stuff under that Transfer of Residence. Each time they do it under a different family member's name, which was actually suggested by a customs official. This won't work if you've taken up foreign citizenship and surrendered your Indian passport (OCI is fine).
That's what I did in my last return trip in 2018, brought over 100kg of electronics after spending a few years abroad. Laptops, phones, desktops, monitors, etc. I kept the purchase receipts in a binder but it wasn't necessary, the customs area was empty when I arrived at 4am so I just strolled out to the exit following the rest of the passengers with my four suitcases that were marked with a chalk X (means the scanner flagged them for inspection).
But the frequent traveller courier service that I mentioned is usually just smaller items like phones or perfumes. Seals broken, boxes are stuffed with underwear in the checked bags and the phones are with the person in a pocket or carry-on. Perfumes would be packed into something else, usually feminine hygeine packaging to deter thieves.
I was a little brazen when I took part in it, because I was younger and careless so I just stuffed things in between towels and jeans and wrapped the suitcase with plastic wrap at one of those wrapping machines at the entrance of the airport.
