Absconding Procedure - what day is considered as date of termination?

With regards to termination cases of employees absconding from duty, what day is considered as date of termination (Last date of working or Date of termination letter sent)
Need clarification on below points:
1. Is employer liable if an employee asked for any company benefits (ex. Mediclaim, insurance etc) in-between the post last date of working to date of termination.
2. Is it organisation's non compliance for dual employment If, an absconded employee join other company before we terminate him from current job responsibilities.

With regards to termination cases of employees absconding from duty, what day is considered as date of termination (Last date of working or Date of termination letter sent) - Normally in case of termination, specific date of termination is mentioned which is normally the date from which the employee is absconding from his/her duties. If no date mentioned in the termination letter then termination date will be date of letter.
Need clarification on below points:
1. Is employer liable if an employee asked for any company benefits (ex. Mediclaim, insurance etc) in-between the post last date of working to date of termination. - Once employee is terminated after following all necessary formalities such as - show cause letter, enquiry, charge sheet then employee won't able to claim for these type of benefits.
2. Is it organisation's non compliance for dual employment If, an absconded employee join other company before we terminate him from current job responsibilities. - No it is not not compliance of the organisation from where the employee is absconding but yes it is non compliance if employer is hiring an employee without proper completion of formalities from previous employer.