3
There is always a discussion about this subject, so I don?t think you will find any clear and cut solution about this.
In general, the opening is considered more important than any burocratic event.

4
Sorry, I think I worded my question wrong. The business is semi-formally/informally open now. The registration papers are not signed and mailed yet. In mailing business papers, should I focus more on the signing or the actual dropping in the mail box.

5
My advice would be to focus on the possibilities for election. Are all the best elections outside of office hours? If so then perhaps electing the posting would be your best bet :)

However, the signing of a document would seem to be more relevant to the life of the business. Unless of course it depends upon something happening following the posting of the letter, for example if it's something legal which has to be verified before the business is fully operational.

It's up to you - pick the best election you can, then do something significant at that time...