Just for clarity, your new ID's are not paper or plastic documents. Star Wars is generally a paperless society, though flimsyplast is used from time to time.
Your ID's are a cryptographically signed chip in a plastic holder (similar in form factor to a MicrsoSD card) that includes a mini holographic display. The chip holds encoded genetic data and various salient points about your identity. At standard checkpoints, only the data on the card is checked. At higher end checkpoints, the data is compared to the identity repository on the Imperial Network to ensure the data is accurate. The chip includes tamper-protection technology to verify the data has not been altered.
To pull off ID's that would pass Imperial Inspection, your contact must have access to Imperial cryptographic keys, and a way to alter the Imperial database.
They should be good enough for standard Imperial checkpoints, but there are clues if someone goes digging. For example, if someone does a search for just the genetic data, they could pull up multiple ID's, which would flag them as potentially fraudulent. The Empire also runs integrity checks on their citizens from time to time specifically looking for signs of fraud, and those would burn the ID's you now hold. If that happens before six months are up, you can get new ones made free of charge. That's the only guarantee he can make.
There is always a risk with fake ID's, and that risk goes up the closer you go to the core worlds.
It's also possible that Imperial Intelligence has flagged a genetic trace for detention, regardless of the ID the trace matches. That has been known to happen, though rarely, and such things are not generally network-wide unless the individual sought was extremely valuable to the Empire. The Empire has also been known to deploy genetic sniffers, technology that able to passively sample thousands of genetic traces out of the air. People leave genetic fragments just walking around, so in high-risk or sensitive areas, such sniffers can scan large crowds for potential targets. If a sensor gets tripped, areas are locked down and detailed genetic scans are done on all occupants of the area until the target is found.
In the mid-rim (where you are), you've heard of these things happening, but never seen them directly. It's not a common occurrence this far out, but it would be more common the closer you are to the core worlds.
So, the ID's are good and buried deep in the network, but are not perfect.
I just wanted to make sure you understood the risks.