Al: I don't mean to parse your words, but offer this as an "editor" . . . remember, for accuracy in your writing project, burglaries may not involve a "break-in" . . . merely entering with the intent is sufficient for a burglary to have happened. Nor does anything have to be stolen in this process - just the entry is enough. At least that's how it is in most states.
For instance, when a shoplifter enters an open business building to commit a theft, a burglary occurs the instant the thief walks in the open door. Proving the thief's intent may be difficult but it can be done.
What prosecutors charge in court is another matter and they often refuse to file certain charges merely to protect their conviction record (subjective reasons) rather than a cold interpretation of the statute(s) alleged to have been violated.
It is surprising just how many victims fail to secure their property - so, it often happens that burglars walk right into houses, businesses, garages, etc. without having to open a lock. Plus, many folks don't look at stored items for months or years. Thus, if there wasn't some evidence of entry, it may take days, weeks, or months before the loss is discovered. Even a small broken window pane may not be immediately discovered.
I agree that picking a lock or having a key may be the most efficient way to cover up an entry, assuming the building or automobile was locked before the crime. If you wish to run some scenarios by me (as a technical advisor), I'd be glad to assist. E-mail or PM will work. DAVE