It's theft in all instances, both of the monies that should have been accounted for and which they kept, and of the goods they sold.
There also seems to be false accounting (section 17 of the Theft Act 1968) in that they kept a false record that items had been received and put into store, or that they omitted items received from a list in a required record, when in fact they'd taken them and they were not in store at all, and in recording monies as with their employers when the monies were anything but. However I can't see the CPS bothering with that if they have theft counts clearly provable; false accounting is relied on when it is not clear who has been stealing or whether there's been any theft at all.( An employee might falsify records because he wants to keep his job, by hiding his own incompetence, without any theft occurring at all).
This should mean jail in all cases, because it's a theft by people in a position of trust,plus the suspended sentence (s) activated on top of any other term, assuming that the offender is in breach of the order by committing these offences during the period of suspension.
How long for depends very much on what role each defendant played, previous record, any other mitigating circumstances.