Just personal exp, but I bought 4 1.5yr old laying hens this Spring, and they were SO unhappy about being away from their old flock that they went on strike for a MONTH! was worried I'd just bought expensive stewing hens... And when they got it together again, had all sorts of interesting 'output' until they got it together... (Not Buckeyes, just mutts)Yes, these eggs could be from the older hen that is molting.
Or, they could be from the birds you recently purchased. Travel of any real sort (five hours is a lot for a chicken) is going to throw a female off her game, possibly disrupting or delaying laying for as much as a week. Each bird is different, some lay in the travel crate and continue with no problems, some stop for a week or more.