What items would be put in a time capsule for Romeo and Juliet?

A time capsule captures significant objects for a work.  Here are some that are meaningful to the play.

Mask- A mask from the party would be a good thing to include.  This is because Romeo and Juliet met at that party, and the masks that they were wearing would be meaningful keepsakes for them. 

Rope ladder- Romeo used a rope ladder to get into Juliet’s room on their wedding night.  He gave it to the nurse.  The nurse gave it to Juliet even after Romeo was banished so they could have one night together before he left.

Swords- Many swords are used in this play, but those used by Romeo, Mercutio, and Tybalt are important.  Tybalt challenged Romeo to a duel, Romeo refused, and Mercutio jumped in.  Tybalt killed Mercutio, and then Romeo killed Tybalt and was banished.

Juliet’s Vial- Friar Laurence gave Juliet a vial of a potion that she could use to fake her death. 

Take thou this vial, being then in bed,
And this distilled liquor drink thou off;
When presently through all thy veins shall run
A cold and drowsy humour, for no pulse
Shall keep his native progress, but surcease:
No warmth, no breath, shall testify thou livest ... (Act 4, Scene 1)

It would be a meaningful keepsake.  Juliet used it, and ended up in the tomb.  Unfortunately, she woke up to find Romeo dead and then really killed herself.

Friar Laurence’s Letter- Friar Laurence writes a letter to Romeo explaining that Juliet faked her death, but it does not get to him because of the plague delay.  As a result, when he goes to see Juliet, he arrives with his own poison and kills himself.

Romeo’s dagger- After Romeo kills himself with poison, Juliet finds Romeo’s dagger and uses it to kill herself, once she realizes that he doesn’t have any poison left that she can use to kill herself.