Board Resolutions are normally required to issue shares and there are some post-meeting requirements that are needed to effect such an issue (i.e. entering the shareholders into the register of members and balancing the accounts up).
Typically when a new shareholder is purchasing from another the register needs amending to remove the seller and put the buyer in their place.
“Within Days” may suggest that a board meeting was still convened and the trade was effected - Board Meetings are called fairly quickly and a Board Resolution typically only needs 50% of the Board to pass it.
EDIT: these are usually pursuant to the Company’s Articles of Association