Do you know who the bag belongs to? There is a clue about who the bag belongs to on Summer's blog.

The bag belongs to Jessica.

The blog post titled "Jessica" says Summer overheard Jessica talking about keeping something in a safe. There is an image of a safe on the gray bag.

Now that we know the bag is Jessica's, we need to look for clues Jessica might have left that could be translated into a 3 digit code (because the lock on the bag requires a 3 digit code).

Look carefully at all evidence that's labelled as Jessica's, as well as evidence where the owner or source is unclear (i.e. we don't know who wrote something or who something belongs to). If the owner or source of a piece of evidence is unclear, look at any handwriting on it and see if it matches any known sources of handwriting (like witness statements).

The handwriting on the post-it note affixed to the Erikson's Stages of Psychosocial Development Chart matches Jessica's handwriting (from her witness statement). We can assume the chart (and post-it note) are Jessica's.

Are there any clues on the post-it note or chart that might indicate what the 3-digit code for the gray bag is?

The post-it note lists three things to remember and three underlined words. The code for the gray bag is three digits.

Can you link the three underlined words to the Erikson's Stages of Psychosocial Development Chart?

The three underlined words on the post-it note are trust, initiative, guilt. Each of these words is in one of the psychological crises on the chart.

Can you translate the three underlined words into three numbers, using the age-ranges of the psychological crises?

Each psychological crisis on the "Erikson's Stages of Psychosocial Development" chart has two words and an age-range with two numbers (ages). The first word in each crisis translates to the younger age, and the second word translates to the older age.

The code to open the bag is three numbers. The numbers can be derived from the three underlined words on the post-it note: trust, initiative, guilt.

Trust corresponds to the first psychological crisis (age 0-1) and can be matched to age 0. Initiative corresponds to the third crisis (age 3-6) and can be matched to age 3. Guilt also corresponds to the third crisis (age 3-6) and can be matched to age 6. The code to open the bag is 036.