Can people see other NFT images in the same IPFS folder?

I'm currently creating an RNG NFT that can be bought on my website. However, i don't really know when to mint the NFT. Should it be minted to the buyer's wallet after it is bought or after the whole NFT collection is sold. My concern is if the minting is done right after the user bought the NFT, then the buyer can see the NFT metadata in the contract which means he can see the IPFS folder.

ipfs://{CID}/001.png

If this is the case, it means he can see other NFT images in that folder based on the IPFS base URI, so he can track when to buy the NFT to get the rare one. Is this the right way to store RNG NFT images? or should it be minted after sales so people cannot see the IPFS uri before all of the NFTs are sold? or is there another way to mint this RNG NFTs?