Just a quick add to note that there is a file on my github repo (see the user made sets thread) with an updated list of needed brick numbers, they are currently in number order but I'm intending to add how many sets I have LDRs for are missing each block so they can be prioritised! (Also I have found that there is indeed a block in Bricksperience with a print on it... but I'll let you off since it is a for a milk carton! ;) - Are you made of the White stuff? :D :D
[Edit: To save hunting for this the URL is:
https://github.com/PhoenixRiver/bricksperience-models
With the file being called "missing_bricks.txt" - it is a little out of date compared to the sets already available from the github and they still don't have how many blocks are missing but it's a start! ;]