I inspected a house that appeared to originally have a 100A Panel box in the basement. A 200A panel was installed in the garage and they just removed all the breakers in the 100A box and then connected the circuit wires to new wires that ran to the new panel box. Is this ok to do?
Yes, as long as all connections are inside the junction box, they didnt downsize any conductors, and the box needs to also be bonded (grounded)
Looks like it may not be bonded with those bare grounding conductors
The other concern is overcurrent protection. Is there a disconnect at the exterior? Or is the first one at the new panel? You cant have conductors with no overcurrent running across the home
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No problem. Just recommend to secure the door, just like a junction box with a cover plate.
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What those guys said and…
…screwing the door shut works around here.
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Screwing the door shut works. But, the box still needs to be “accessible” and the screw removable.
But, of course.
Looks like the latch is still intact so screws would not be required. What are the large conductors feeding?
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Good point, Rob. Thanks. 
All the wires from this box appear run directly to the 200A panel located in the garage (inside) and connect to breakers. The main disconnect is in that Panel. The meter is located on the exterior wall directly behind the main panel.
Yes. Latch still works find
Hold on, not so fast. The latch on a breaker box leads to an electrically safe area with only switches.
The latch on the pictured box leads to an area particularly bad for gefingerpoken und mittengrabben.
Carefully drilling a hole for a screw (avoiding metal debris) could raise the bar to entry in a helpful way.
ACHTUNG! ALLES LOOKENSPEEPERS! Das computermachine ist nicht fuer gefingerpoken und mittengrabben . Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitzensparken. Ist nicht fuer gewerken bei das dumpkopfen. Das rubbernecken sichtseeren keepen das cotten-pickenen hans in das pockets muss; relaxen und watchen das blinkenlichten.
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I think Rob was referring to code but inspectors can recommend what they want for safety. 
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Sure, all good. Now regarding code, is it required to mark the box “no fuses, junction only”. Everyone around here does it.
Around here they want the box marked as a “junction box”.
Ok. Because you had said this was the original panel, in the basement, so wanted to make sure that the service feeders didn’t go from here to the new panel, and then have a disconnect at that point.
In my area it’s standard to screw the panel closed, presumably to keep a kid or other curious folks from just pulling it open.
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That’s correct. And there is no marking required by the NEC when the old panel cabinet is used as a junction box.
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The way I am reading this is that 100A wiring is only protected by a 200A breaker?? Is the main in the new panel a 200A breaker with no other OCPD between it and the meter?
Same here, similar to a J-box.
New 200A panel has breakers protecting all circuits that were connected together in the old 100A box