Greetings Harsha,
As other members have pointed out, unless you furnish the facts completely, you are unlikely to get the right response.
As a member has pointed out,
Condition 1 Canteen if it is run inside your company premises will be considered as an extension of your workplace.
Condition 2 It is unclear from your statement as to whether you suffered the injury during lunch break (as lunch break is sandwiched between the working hours of the day). If you have suffered injury during your lunch break it will be treated as an employment injury provided condition 1 is satisfied. However, if it has happened either before or after the scheduled lunch break the reasons for your being there needs to be explained appropriately.
Condition 3 The difference between Employee Compensation Act and Personal Accident Policy is Employee Compensation Act confines to injury suffered in the course and out of employment and includes notional extension, whereas Personal Accident Policy coverage extends 24 hours worldwide and does not limit to injury suffered in the course and out of employment. In other words it covers injury suffered due to accident on a day of Weekly off even outside the work premises.
Hence, if you pose your question suitably, members will respond appropriately.
As regards the amount deposited by your boss, you may have to check it out with him, as he would have extended timely help with his personal resource.
Regarding the reimbursement of amount from the company, the right source will of course be your HR department.
Regards