what's the difference between the "very limited edition of 500" and the rest that are being sold to the classic online store?

If I understand correctly:

In the classic online store, you get the physical stamp, and you can redeem the digital token (by scratching the card and revealing the 12-word private key seed). The colour (i.e. rarity) of the digital asset that you will receive is random

In the OnChain store, you receive the digital asset when you place the order (and send payment in ETH), and then fill the form with your delivery details in order to receive the physical stamp. The colour (i.e. rarity) of the digital asset that you will receive is kinda random (since those are being distributed in a specific token number order through the smart contract, you can always see the color rarity of the next token that is going to be distributed by the contract before placing the order. Hence you might be able to "choose" a desirable color. THose should be distributed in "random" token number order through the smart contract, and not sequentially)

What exactly makes those first 500 stamps as "very limited edition", and justifies the increasing value of those last 100 to be sold through the OnChain store? OnChain orders, will receive an envelope with a physical stamped/cancelled stamp, where the left part of the stamp (with the private key seed) will be missing? Will this onchain shop physical stamp will be differentiated from the physical stamps received through the  classic online store? (hence that's the limited edition status?)

please elaborate  

edit:

going to the following URL https://crypto.post.at/asset you can scan the QR on the physical card (or just enter the 5 digit code on it), and see the asset that is bound with the specific physical card. I clearly understand that this is a feature for collectors. You can see the rarity of the digital asset that the physical card has, without the need of scratching any of area of the card (you only need to reveal the private key seed, if you would like to sweep it to your wallet).

I have seen in various places, photos of how those physical cards are being sold in various point of sales in Austria (please see the below photo). The QR code (and the 5 digit code) is in plain view. Hence someone could go with his/her mobile phone to a store, quickly scan the QR code of all the cards, and purchase only those cards that hold the rare red stamp digital token. I believe that the QR code should be sealed beneath the cardboard (i.e. not in a public view), and someone should be able to reveal the QR code ONLY after purchasing the card (and tear apart the cardboard).

This is not a good design approach IMO... but hey... that's just my 2 satoshis....



edit 2:

are all of the digital tokens already minted? In the different colour properties (in opensea), I can see only a portion available from the total mintage. If not, how the rest is going to be distributed?

by seeing how popular those crypto stamps (Crypto stamp Edition 1) became, any plans of producing a series 2 (edition 2) in the near future?