The Puzzling Parchment

"The owner has asked me to give you this box." The female assistant snapped out from her reverie and hurriedly bowed her head. "Please accept it. The box should be kept in extremely low temperature, so we'd ask that you'd put it somewhere safe."

When Yao Tang opened the box, she saw bottles of medicine stacked together, each with letters written on them.

The female assistant thought back to the serious look on her boss's face. She sized her up, wanting to see what was so different about the new visitor that had affected her boss so much.

"If you don't accept the box, my boss said that I should follow you all the way to your destination."

Seeing as Yao Tang had already accepted the box, she relaxed and stepped out of the way.

What the female assistant didn't know was that if she had spoken a second later, the box would've been hurriedly returned to her without hesitation.