Depends on seller. They could take the money from you as deposit for the said items that you pre-booked and only issue an official receipt when you finally ready to accept deliveries. It's basically a trust issue rather than anything.

I dont think it is necessary to get the warranty card chopped anymore. Most if not all would just require the warranty card (Im guessing to avoid parallel import for some brands) and an official receipt (some shops) from the shop that you made purchase.

Recently bought 2 Khind stand fan from Lazada Senheng and both have problem fitting the grills, probably due to shipping issue. I only brought along the warranty card and they kindly replaced the grill when I pay them a visit.

Not really. I went to their KHIND HQ also they didnt ask much. Just ask me to fill in the warranty card (not chopped by Senheng) without even looking at the receipt.

Bought a Hisense TV and fridge from Onking, warranty card not chopped. Bought a Sony TV and LG AC from Desa Home, warranty card not chopped. Along with some smaller appliances that I bought during MCO all warranty card are not chopped.