Buff Orpingtons yes, Barred Rocks not broody.
I've had 7 Barred Rocks for more than a year, 5 more than 1 1/2 years and the final 3 for 33 months,
none ever went broody.
I recently bought 4 more Barred Rocks, because I don't want any setters.
I buy Sex-links or non-broody breeds. No Cockerels/Roosters here.
I also bought Rhode Island Reds, not known for going broody.
Now any non-broody breed could go broody, just not as common.
Buff Orpington are known to go broody more often than some, but like yours may not. Yours are still relatively young, but I'm thinking your moving tractor coop could discourage broody behavior, but I'm guessing.
My first Flock of Barred Rocks.
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My second flock of Barred Rocks with Rhode Island Reds.
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They are 6 weeks old today. GC