HOW DO YOU GET THE TREASURE CHEST WITHOUT BEING HIRED FROM THE MARKET?
FIRSTLY WHAT IS THE TREASURE CHEST?
The Treasure Chest is a job completion bonus for employees when hired by strangers in the marketplace: The employee is responsible for collecting the bonus on each farm by clicking the Chest icon on the top-left.The employee can change tools in the current farm freely, the only requirement to collect the bonus is to have finished all the jobs for which the employee was hired in the current farm, meaning, if the employee was hired for plow, chop and fish, the current farm must be fully plowed, all trees chopped and all fish caught in order to collect the bonus at the very end of the job. The Treasure Chest must be collected prior to reloading or changing farms to gain the double amount of coins and XP than you normally would plus products.
READ THIS BEFORE TRYING MY TIP?
If you do not see the treasure chest appear on the top left this means that either you as an employee or the employer is a neighbour or a buddy to the other person. It is a good idea to check this before you start. You can still be FaceBook friends, you do not have to be total strangers. Sometimes even communicating using the FaceBook chat can be handy. Always let each other know your avatar names before hand as this saves confusion. Sometimes if you do not see the treasure chest it can also mean that the farm you are working on is to heavily laden, for example the waters maybe to tightly stacked. This tip can also be used if you are doing a quest and have the employee lifeline. You can still offer your employee the use of your tools. 
1 POST YOUR WORK REQUEST ON A GROUP WALL - remember that prospective employees like to know *exactly what the job is *how much work is involved *only hire your employee for the work you asked to be done.
2 ONCE YOU HAVE HAD A POSITIVE RESPONSE YOU THEN POST YOUR FARM LINK
(click here to learn how)
3 YOU BOTH SHOULD MEET ON THE EMPLOYERS FARM
(then you both are on the same server)
4 YOU BOTH HEAD TO THE INN WHERE THE EMPLOYER CAN HIRE THE EMPLOYEE
(it is easier at the Inn to find each other) 
5 THE EMPLOYEE WILL ACCEPT & THEN DO ALL THE JOBS THEY HAVE BEEN HIRED TO DO ON (1) FARM BEFORE MOVING ONTO THE NEXT FARM.
(you get a warning pop up if you try to collect the treasure chest before you have completed all jobs)
THE EMPLOYEE CAN NOW COLLECT THEIR TREASURE CHEST BONUS.