Useful records and documents are hidden in it.
The library is cleaned by professionals and kept cool and dry.
And imperial edicts and things like that. It was collected by people who received the imperial edict. If it is lost or damaged, decapitation is a big crime.
Speaking of bamboo slips and other things dug up so far. In fact, most of them are funerary objects. Deliberately copy the owner's relevant documents and hide them.
One: Although it is not recorded who kept this letter. But I don't think it belongs to the writer himself.
No matter what era, it is impossible to back up your letters just because you forgot what you wrote. This doesn't make sense in common sense.
I think the recipient kept it.
If it is official hostility, it is even more necessary to preserve it. You can participate in one of his letters at any time.
If the school is different, it can also be used as an argument to refute and reserve. Not only in ancient times, but also in modern times, such as Lu Xun and Hu Shi. It is also impossible to tear up letters because of disagreement, as we know. Both sides kept each other's personal letters.
Two: Speaking of backup.
In addition to retaining the original version and personal collection, the text is widely circulated.
The remaining backup forms can be called records.
Give a simple example.
One day the emperor ordered OOXX.
Then there will be a special historian's record: on X year, X month and X day, Emperor XX issued a decree saying OOXX. And put it in the warehouse.
The books in the library will be carefully preserved.
Spread to this day. The literature we have read may say: Emperor XX said OOXX. This form. I didn't write OOXX on purpose, but was recorded by historians.
I hope the following discussion can help the landlord.