As of EE v 5.30 this is out of date, and no. I will not be making an updated version any time soon
Well here after reading on the wiki that the % chance of attaining the various items was "N/A"
after the 1.15 patch came out with dispensers using Scrapboxes I decided to measure the numbers of what I got from 20 000 scrapboxes:
This is the base Dispenser/collection array:
20 sets of chest/dispenser with obsidian pipes in-front of them to suck up the items produced each chest has 1000 scrapboxes inside
Here is a pic of the other end, the sorting and storage:
the hardest part was storing the unstackable items (I had to constantly baby sit 4 of the 5 storage areas)
Numbers of the collected items seem to be relatively even, except fro dirt which seems to get 2x the chance compared to the rest of the items,
There are 32 seperate items and blocks which you may recive from a scrapbox these are (percentages are worked out using 193 as a base 1%):
wooden Hoe: 543 (2.81%)
Sign: 514 (2.66%)
Dirt:1177 (6.09%) (double chance?)
golden helmet: 440 (2.27%)
Leather: 574 (2.97%)
Minecart: 521 (2.69%)
Grass: 557
Pumpkin:
599
Sandstone:
577
Soulsand:
630
Netherrack:
597
Plantball:
618
Slimeball: 577 (2.98%)
Rubber:
617
Apple:
619
Bread:
631
Porkchop (cooked):
609
Cake:
617
Coal dust:
593
Redstone dust:
564
Glowstone Dust:
583
Tinned food:
579
SU Battery:
583
Tin dust:
633
Tin ore:
584
Copper dust:
634
Copper ore:
588
Iron dust:
630
Iron ore:
555
Gold dust:
606
Gold ore:
568
Diamond: 597 (3.09%)
Amassing to a total of 19314 items this means that over 600 items were spat so randomly (damn you and your randomness Notch!) out of the dispensers that they didnt get sucked up by the obsidian pipes
As you can see most of the numbers are relatively similar with the singular exception of dirt.
please use this data to improve the wiki and whatever else you may wish to use it for (no rule #34 please)