Don't think Delta ever gave those out and I am not sure what they would be used for. Time would be better spent doing the practice tests and ESV preparation.
The 737NG's (and Boeing) flows are very simple. The avionics can be a bit much for someone who is not used to them. For that, a copy of FSX and the PDMG 73NG would work.
PMDG Simulations
There's a good study guide floating around but if I dared to offer to send you a copy my box would be instantly full of "mee too." For new hire training the guide is too much. The guy who wrote it knows a lot more than they require that you know now days ... these days the focus is on safe and competent operation of the aircraft ... a very high level overview of systems beyond that. But really Delta provides what you need and there are procedures trainers (forgot what they call them) that are usually available too.