Depending on the year of the attachment points are slightly different.

Below are the procedures to fix the bumpers. Arrows indicate the location of the screws. Bumper removed very easily, and describe here is nothing special. A big problem to remove the screws than to find them.

Front bumper

 

the attachment of the front bumper Peugeot Boxer (1994-2006)

the scheme of fastening of the front bumper Peugeot Boxer (1994-2006)

the scheme of fastening of the front bumper Peugeot Boxer (1994-2006)

Rear bumper

 

the attachment of the rear bumper Peugeot Boxer (1994-2006)

the scheme of fastening of the rear bumper Peugeot Boxer (1994-2006)

 

How to remove front and rear bumper Peugeot Boxer (since 2006)