Posted by @girl22721 on 7 July 2017:
I had a farm of around 500 x Lard Lad for quite awhile. If you don't mind their size, the earnings from them are pretty good, being premium with 4 hour collection time; however I've grown tired of such short collection times and I no longer need this level of earnings so replaced them all. I put thousands of houses and other farmed buildings into storage; replaced only by orange houses, simply because those have the longest collection times (16 hours). I've recently passed $1 billion and 6000% multiplier, so don't need to be too concerned about maximising earnings anymore!
That said, I never sell anything either (except for trucks and KEMs of course) since you only get 25% back!
There are basically 3 levels of cycles to the Mystery Box results, although the general shape of the basic 7-8 item patterns are all you really need to know, together with the fact that it works out at slightly under 8 donuts per 1% bonus. The outcomes are fixed and you can stop/start buying them whenever you like, it always resumes from where you left off. The only time it ever deviates is sometimes when the game is very very lagged you can win multiples of the same item consecutively; until it catches up. The 7-8 item patterns make up longer sequences, of which there are 2 variations that alternate after multiple iterations. I probably purchased nearly 10,000 boxes before I retired from building multiplier that way, recording the results so that I could chart and predict them.
From page 24 of the ‘what is your multiplier’ thread, posted September 5th 2017:
"girl22721;c-1711342" wrote:
Okay, here's my chart based on purchasing and tracking the results from many thousands of mystery boxes... there are 8 different patterns of prizes (I've assigned them letters A to H) which follow a fixed order to make two sequences (blue and red) as listed below the chart. The game repeats each sequence 8 times then alternates to the other sequence (the switchover between them actually happens mid-sequence, so please be prepared for a minor change during each 8th iteration)! Enjoy!
https://i.imgur.com/oPPaclO.jpg